In most cases, a corndog is a joint rolled with a small (or large depending on your taste and tolerance) amount of cocaine in it. Supposed to give you the effects of both without the speedy high of snorting. Not for the beginner.

"Yo bro you fixin to get all bent sideways?"
"Yea sure im down ill roll up a corndog."

Encasing a public toilet handle with a turd either by jamming it on by hand or rectally impaling the handle in one's ass, the slowly taking a shit as one pulls out, leaving the corn dog effect on the handle.

Corndog (n.): a stupid person, more stupid than a clown or douchebag; a walking coated meat popsicle; a mindless consumer.

Me: I'm amused by the way parents tell kids about how there's people "in charge of" things like "honking horn"... there's one person in charge of blah and there's one person in charge of pleh and there's one person in charge of meh
Friend: Kids want to learn, are curious. Parents are stupid
Me: yeah, because the guy that is in charge of the coffee can't be the same one in charge of the horn. if we talk to them like people instead of like corndogs, maybe they'd be smarter
Friend: Haha

Me: and maybe if instead of telling them everything we let them just watch, they wouldn't think we're ask as dumb as corndogs
Friend: Corndogs :D